Line your 6-quart slow cooker with a disposable liner or spray it with cooking spray.
In a large bowl, combine drained sweet potatoes, 4 tablespoons of butter, sugar, salt, brown sugar, orange juice, eggs, vanilla extract, and evaporated milk. Beat until smooth.
Pour the sweet potato mixture into the prepared slow cooker and smooth the top.
In a medium bowl, mix topping ingredients: pecans, brown sugar, flour, vanilla extract, butter, and salt until crumbly. If too wet, add flour until desired consistency.
Sprinkle the topping evenly over the sweet potato mixture without pressing down.
Cover and cook on high for 2.5 to 4 hours, or until edges are lightly browned and center is firm.
After cooking, let it stand for 20 minutes before serving.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3-4 days.